Abstract
In this study, the photocatalyst TiO2 was mixed with a general paint and applied on indoor walls as part of a mock-up test to measure the reduction in the NOx concentration affected by the on or off state of a UV lamp. The findings may be summarized as follows; the NOx concentration was reduced by approximately 7% more (0.134 ppm) with the UV lamp on than when the lamp was off in the indoor space where the paint mixed with TiO2 was applied.
Highlights
In recent years, particulate matter (PM10) have received much public attention due to their effects on health
With many people currently spending more than 90% of their time indoors, particulate matter have become a health threat to indoor residents
To explore one of the methods of reducing particulate matter, a mock-up test was conducted in this study, to examine the performance of TiO2-mixed paint for indoor use in reducing NOx, one of the main precursors to particulate matter
Summary
For the purpose of the study, TiO2 – known for its airpurifying property – was mixed with a general paint and applied on the walls inside a mock-up test room (2,675 × 2,750 × 2,860). After the TiO2-mixed paint was applied on the walls, NOx, one of the major precursors to particulate matter, was injected, in the form of a gas, into the room until a certain level of concentration (2 ppm) was attained. It was found that in the closed room where TiO2-mixed paint was applied on the walls, the NOx concentration was approximately 7% (0.134 ppm) lower with the UV lamp on than with the lamp off. Contents NO gas UV-A BLB lamp, 0.505 mW/cm[2] UV ON-OFF 3 times, total 6 times 1 min Chemiluminescence instrument 3 hours after attaining 2 ppm concentration in test room
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